# -*- coding: UTF-8 -*-
#
#       printing.py
#       
#       Copyright 2009-2011 Giuseppe Penone <giuspen@gmail.com>
#       
#       This program is free software; you can redistribute it and/or modify
#       it under the terms of the GNU General Public License as published by
#       the Free Software Foundation; either version 2 of the License, or
#       (at your option) any later version.
#       
#       This program is distributed in the hope that it will be useful,
#       but WITHOUT ANY WARRANTY; without even the implied warranty of
#       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#       GNU General Public License for more details.
#       
#       You should have received a copy of the GNU General Public License
#       along with this program; if not, write to the Free Software
#       Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
#       MA 02110-1301, USA.

import gtk, gobject, pango, cairo
import copy
import support, cons


class PrintData:
   """Print Operation Data"""
   text = None
   layout = None
   layout_is_new_line = None
   layout_num_lines = None
   page_breaks = None
   all_lines_y = None
   

class PrintHandler:
   """Handler for the CherryTree Prints"""
   
   def __init__(self):
      """Instantiate Variables"""
      self.active_prints = []
      self.settings = None
      self.page_setup = None
   
   def get_print_operation(self):
      """Return a Print Operation"""
      print_operation = gtk.PrintOperation()
      print_operation.set_show_progress(True)
      if self.page_setup is None: self.page_setup = gtk.PageSetup()
      if self.settings is None: self.settings = gtk.PrintSettings()
      print_operation.set_default_page_setup(self.page_setup)
      print_operation.set_print_settings(self.settings)
      return print_operation
   
   def run_print_operation(self, print_operation, parent):
      """Run a Ready Print Operation"""
      try: res = print_operation.run(gtk.PRINT_OPERATION_ACTION_PRINT_DIALOG, parent)
      except gobject.GError, ex:
         support.dialog_error("Error printing file:\n%s (exception catched)" % str(ex), parent)
      else:
         if res == gtk.PRINT_OPERATION_RESULT_ERROR:
            support.dialog_error("Error printing file (bad res)", parent)
         elif res == gtk.PRINT_OPERATION_RESULT_APPLY:
            self.settings = print_operation.get_print_settings()
      if not print_operation.is_finished():
         print_operation.connect("status_changed", self.on_print_status_changed)
   
   def on_print_status_changed(self, operation):
      """Print Operation Status Changed"""
      if operation.is_finished(): active_prints.remove(operation)
   
   def print_text(self, window, pango_text, text_font, code_font, pixbuf_table_codebox_vector, text_window_width):
      """Start the Print Operations for Text"""
      self.pango_font = pango.FontDescription(text_font)
      self.codebox_font = pango.FontDescription(code_font)
      self.text_window_width = text_window_width
      self.table_text_row_height = self.pango_font.get_size()/pango.SCALE
      self.table_line_thickness = 6
      self.pixbuf_table_codebox_vector = pixbuf_table_codebox_vector
      # pixbuf_table_codebox_vector is [ [ "pixbuf"/"table"/"codebox", [offset, pixbuf, alignment] ],... ]
      print_data = PrintData()
      print_data.text = pango_text
      print_operation = self.get_print_operation()
      print_operation.connect("begin_print", self.on_begin_print_text, print_data)
      print_operation.connect("draw_page", self.on_draw_page_text, print_data)
      self.run_print_operation(print_operation, window)

   def on_begin_print_text(self, operation, context, print_data):
      """Here we Compute the Lines Positions, the Number of Pages Needed and the Page Breaks"""
      self.page_width = context.get_width()
      self.page_height = context.get_height() * 1.02 # tolerance at bottom of the page
      while 1:
         exit_ok = True
         print_data.layout = []
         print_data.layout_is_new_line = []
         print_data.layout_num_lines = []
         print_data.all_lines_y = []
         #print "print_data.text", print_data.text
         for i, text_slot in enumerate(print_data.text):
            print_data.layout.append(context.create_pango_layout())
            print_data.layout[-1].set_font_description(self.pango_font)
            print_data.layout[-1].set_width(int(self.page_width*pango.SCALE))
            print_data.layout[-1].set_markup(text_slot)
            if text_slot == cons.CHAR_NEWLINE:
               print_data.layout_is_new_line.append(True) # in other case we detect the newline from a following line
            else: print_data.layout_is_new_line.append(False) # but here we have a single layout line
            print_data.layout_num_lines.append(print_data.layout[-1].get_line_count())
         self.y_idx = 0
         print_data.page_breaks = []
         curr_y = float(0)
         inline_pending_height = float(0)
         inline_starter = [0, 0]
         for i, layout in enumerate(print_data.layout):
            #print "layout", i
            # text
            layout_line_idx = 0
            while layout_line_idx < print_data.layout_num_lines[i]:
               #print "layout_line_idx", layout_line_idx
               layout_line = print_data.layout[i].get_line(layout_line_idx)
               line_width, line_height = self.layout_line_get_width_height(layout_line)
               # process the line
               if line_height > inline_pending_height: inline_pending_height = line_height
               if layout_line_idx < print_data.layout_num_lines[i]-1 or print_data.layout_is_new_line[i]:
                  if curr_y + inline_pending_height > self.page_height:
                     print_data.page_breaks.append(inline_starter)
                     #print "added page break", inline_starter
                     curr_y = 0
                     if inline_pending_height > self.page_height:
                        if self.pixbuf_table_codebox_vector[i-1][0] == "codebox"\
                        and codebox_height > self.page_height:
                           self.codebox_long_split(i-1, context, print_data)
                           exit_ok = False
                           break # go to a new main loop
                  curr_y += inline_pending_height
                  print_data.all_lines_y.append(curr_y)
                  #print "added line y <%s> (%s, %s)" % (curr_y, i, layout_line_idx)
                  inline_pending_height = 0 # reset the pending elements line to append
                  inline_starter = [i, layout_line_idx+1]
               layout_line_idx += 1
            if not exit_ok: break # go to a new main loop
            # pixbuf or table or codebox
            if i < len(print_data.layout) - 1: # the latest element is supposed to be text
               if self.pixbuf_table_codebox_vector[i][0] == "pixbuf":
                  pixbuf = self.pixbuf_table_codebox_vector[i][1][1]
                  pixbuf_height = pixbuf.get_height() + cons.WHITE_SPACE_BETW_PIXB_AND_TEXT
                  if inline_pending_height < pixbuf_height: inline_pending_height = pixbuf_height
               elif self.pixbuf_table_codebox_vector[i][0] == "table":
                  table = self.pixbuf_table_codebox_vector[i][1][1]
                  table['matrix'].insert(0, table['matrix'].pop()) # let's put the title to first row
                  table_layouts = self.get_table_layouts(context, table)
                  table_grid = self.get_table_grid(table_layouts, table['col_min'])
                  table_height = self.get_table_height_from_grid(table_grid)
                  if inline_pending_height < table_height: inline_pending_height = table_height
               elif self.pixbuf_table_codebox_vector[i][0] == "codebox":
                  codebox_dict = self.pixbuf_table_codebox_vector[i][1][1]
                  codebox_layout = self.get_codebox_layout(context, codebox_dict)
                  codebox_height = self.get_height_from_layout(codebox_layout)
                  if inline_pending_height < codebox_height: inline_pending_height = codebox_height
         if exit_ok: break
      operation.set_n_pages(len(print_data.page_breaks) + 1)
      
   def on_draw_page_text(self, operation, context, page_nr, print_data):
      """This Function is Called For Each Page Set in on_begin_print_text"""
      if page_nr == 0: start_line_num = [0, 0] # layout num, line num
      else: start_line_num = print_data.page_breaks[page_nr - 1]
      #print "start_line_num", start_line_num
      if page_nr < len(print_data.page_breaks): end_line_num = print_data.page_breaks[page_nr]
      else: end_line_num = [len(print_data.layout)-1, print_data.layout_num_lines[-1]]
      #print "end_line_num", end_line_num
      cairo_context = context.get_cairo_context()
      cairo_context.set_source_rgb(0.5, 0.5, 0.5)
      cairo_context.set_font_size(12)
      page_num_str = "%s/%s" % (page_nr+1, operation.get_property("n-pages"))
      cairo_context.move_to(self.page_width/2, self.page_height+17)
      cairo_context.show_text(page_num_str)
      curr_x = float(0)
      i = start_line_num[0]
      layout_line_idx = start_line_num[1]
      while i <= end_line_num[0]:
         # text
         cairo_context.set_source_rgb(0, 0, 0)
         if i > start_line_num[0]: layout_line_idx = 0 # reset line idx
         while layout_line_idx < print_data.layout_num_lines[i]:
            layout_line = print_data.layout[i].get_line(layout_line_idx)
            line_width, line_height = self.layout_line_get_width_height(layout_line)
            # process the line
            if line_width > 0:
               #print "text (%s, %s) to (%s, %s)" % (line_width, line_height, curr_x, print_data.all_lines_y[self.y_idx])
               cairo_context.move_to(curr_x, print_data.all_lines_y[self.y_idx])
               cairo_context.show_layout_line(layout_line)
               curr_x += line_width
            if layout_line_idx < print_data.layout_num_lines[i]-1 or print_data.layout_is_new_line[i]:
               curr_x = 0.0
               self.y_idx += 1
               #print "new index value <%s> (%s, %s)" % (self.y_idx, i, layout_line_idx)
            layout_line_idx += 1
            if i >= end_line_num[0] and layout_line_idx >= end_line_num[1]: return
         # pixbuf or table or codebox
         if i < len(print_data.layout) - 1: # the latest element is supposed to be text
            if self.pixbuf_table_codebox_vector[i][0] == "pixbuf":
               pixbuf = self.pixbuf_table_codebox_vector[i][1][1]
               pixbuf_width = pixbuf.get_width()
               pixbuf_height = pixbuf.get_height()
               #print "pixbuf (%s, %s) to (%s, %s)" % (pixbuf_width, pixbuf_height, curr_x, print_data.all_lines_y[self.y_idx]-pixbuf_height)
               cairo_context.set_source_pixbuf(pixbuf, curr_x, print_data.all_lines_y[self.y_idx] - pixbuf_height)
               cairo_context.paint()
               curr_x += pixbuf_width
            elif self.pixbuf_table_codebox_vector[i][0] == "table":
               table = self.pixbuf_table_codebox_vector[i][1][1]
               table_layouts = self.get_table_layouts(context, table)
               table_grid = self.get_table_grid(table_layouts, table['col_min'])
               table_width = self.get_table_width_from_grid(table_grid)
               table_height = self.get_table_height_from_grid(table_grid)
               self.table_draw_grid(cairo_context,
                                    table_grid,
                                    curr_x,
                                    print_data.all_lines_y[self.y_idx] - table_height,
                                    table_width,
                                    table_height)
               self.table_draw_text(cairo_context,
                                    table_grid,
                                    table_layouts,
                                    curr_x,
                                    print_data.all_lines_y[self.y_idx] - table_height)
               curr_x += table_width
            elif self.pixbuf_table_codebox_vector[i][0] == "codebox":
               codebox_dict = self.pixbuf_table_codebox_vector[i][1][1]
               codebox_layout = self.get_codebox_layout(context, codebox_dict)
               codebox_height = self.get_height_from_layout(codebox_layout)
               codebox_width = self.get_width_from_layout(codebox_layout)
               #print "codebox (%s, %s) to (%s, %s)" % (codebox_width, codebox_height, curr_x, print_data.all_lines_y[self.y_idx]-codebox_height)
               self.codebox_draw_box(cairo_context,
                                     curr_x,
                                     print_data.all_lines_y[self.y_idx] - codebox_height,
                                     codebox_width,
                                     codebox_height)
               self.codebox_draw_code(cairo_context,
                                      codebox_layout,
                                      curr_x,
                                      print_data.all_lines_y[self.y_idx] - codebox_height)
               curr_x += codebox_width
         i += 1 # layout increment
   
   def get_codebox_layout(self, context, codebox_dict):
      """Return the CodeBox Layout"""
      layout = context.create_pango_layout()
      layout.set_font_description(self.codebox_font)
      if codebox_dict['width_in_pixels']: codebox_width = codebox_dict['frame_width']
      else: codebox_width = self.text_window_width*codebox_dict['frame_width']/100
      if codebox_width > self.page_width: codebox_width = self.page_width
      layout.set_width(int(codebox_width*pango.SCALE))
      layout.set_wrap(pango.WRAP_WORD_CHAR)
      layout.set_markup(codebox_dict['fill_text'])
      return layout
   
   def get_height_from_layout(self, layout):
      """Returns the Height given the Layout"""
      height = 0
      num_layout_lines = layout.get_line_count()
      for layout_line_idx in range(num_layout_lines):
         layout_line = layout.get_line(layout_line_idx)
         line_width, line_height = self.layout_line_get_width_height(layout_line)
         height += line_height
      return height + 2*cons.GRID_SLIP_OFFSET
      
   def get_width_from_layout(self, layout):
      """Returns the Height given the Layout"""
      width = 0
      num_layout_lines = layout.get_line_count()
      for layout_line_idx in range(num_layout_lines):
         layout_line = layout.get_line(layout_line_idx)
         line_width, line_height = self.layout_line_get_width_height(layout_line)
         if line_width > width: width = line_width
      return width + 2*cons.GRID_SLIP_OFFSET
   
   def get_table_layouts(self, context, table):
      """Return the Table Cells Layouts"""
      table_layouts = []
      for i, table_row in enumerate(table['matrix']):
         table_layouts.append([])
         for j, cell_text in enumerate(table_row):
            layout = context.create_pango_layout()
            layout.set_font_description(self.pango_font)
            if i == 0: cell_text = "<b>" + cell_text + "</b>"
            layout.set_width(int(table['col_max']*pango.SCALE))
            layout.set_wrap(pango.WRAP_WORD_CHAR)
            layout.set_markup(cell_text)
            table_layouts[i].append(layout)
      return table_layouts
   
   def layout_line_get_width_height(self, layout_line):
      """Returns Width and Height of a layout line"""
      ink_rect, logical_rect = layout_line.get_extents()
      lx, ly, lwidth, lheight = logical_rect
      return [lwidth / 1024.0, lheight / 1024.0]
   
   def get_table_grid(self, table_layouts, col_min):
      """Returns the Dimensions of Rows and Columns"""
      rows_h = [0] * len(table_layouts)
      cols_w = [col_min] * len(table_layouts[0])
      for i, layout_row in enumerate(table_layouts):
         for j, layout_cell in enumerate(layout_row):
            cell_height = 0
            num_layout_lines = layout_cell.get_line_count()
            for layout_line_idx in range(num_layout_lines):
               layout_line = layout_cell.get_line(layout_line_idx)
               line_width, line_height = self.layout_line_get_width_height(layout_line)
               cell_height += line_height
               if cols_w[j] < line_width: cols_w[j] = line_width
            if rows_h[i] < cell_height: rows_h[i] = cell_height
      return [rows_h, cols_w]
   
   def get_table_width_from_grid(self, table_grid):
      """Returns the Table Width given the table_grid vector"""
      table_width = 0
      for col_w in table_grid[1]:
         table_width += (col_w + self.table_line_thickness)
      return table_width
      
   def get_table_height_from_grid(self, table_grid):
      """Returns the Table Height given the table_grid vector"""
      table_height = 0
      for row_h in table_grid[0]:
         table_height += (row_h + self.table_line_thickness)
      return table_height
   
   def codebox_draw_box(self, cairo_context, x0, y0, codebox_width, codebox_height):
      """Draw the CodeBox Box"""
      cairo_context.set_source_rgba(0, 0, 0, 0.3)
      cairo_context.rectangle(x0, y0, codebox_width, codebox_height)
      cairo_context.stroke()
   
   def table_draw_grid(self, cairo_context, table_grid, x0, y0, table_width, table_height):
      """Draw the Table Grid"""
      x = x0
      y = y0
      cairo_context.set_source_rgba(0, 0, 0, 0.3)
      # draw lines
      cairo_context.move_to(x, y)
      cairo_context.line_to(x + table_width, y)
      for row_h in table_grid[0]:
         y += (row_h + self.table_line_thickness)
         cairo_context.move_to(x, y)
         cairo_context.line_to(x + table_width, y)
      # draw columns
      y = y0
      cairo_context.move_to(x, y)
      cairo_context.line_to(x, y + table_height)
      for col_w in table_grid[1]:
         x += (col_w + self.table_line_thickness)
         cairo_context.move_to(x, y)
         cairo_context.line_to(x, y + table_height)
      cairo_context.stroke()

   def table_draw_text(self, cairo_context, table_grid, table_layouts, x0, y0):
      """Draw the text inside of the Table Cells"""
      cairo_context.set_source_rgb(0, 0, 0)
      y = y0
      for i, row_h in enumerate(table_grid[0]):
         x = x0 + cons.GRID_SLIP_OFFSET
         for j, col_w in enumerate(table_grid[1]):
            layout_cell = table_layouts[i][j]
            local_y = y
            num_layout_lines = layout_cell.get_line_count()
            for layout_line_idx in range(num_layout_lines):
               layout_line = layout_cell.get_line(layout_line_idx)
               line_width, line_height = self.layout_line_get_width_height(layout_line)
               cairo_context.move_to(x, local_y + line_height)
               local_y += line_height
               cairo_context.show_layout_line(layout_line)
            x += col_w + self.table_line_thickness
         y += row_h + self.table_line_thickness
   
   def codebox_draw_code(self, cairo_context, codebox_layout, x0, y0):
      """Draw the code inside of the Box"""
      cairo_context.set_source_rgb(0, 0, 0)
      y = y0
      num_layout_lines = codebox_layout.get_line_count()
      for layout_line_idx in range(num_layout_lines):
         layout_line = codebox_layout.get_line(layout_line_idx)
         line_width, line_height = self.layout_line_get_width_height(layout_line)
         cairo_context.move_to(x0 + cons.GRID_SLIP_OFFSET, y + line_height)
         y += line_height
         cairo_context.show_layout_line(layout_line)
   
   def codebox_long_split(self, idx, context, print_data):
      """Split Long CodeBoxes"""
      codebox_dict = self.pixbuf_table_codebox_vector[idx][1][1]
      original_splitted_pango = codebox_dict['fill_text'].split(cons.CHAR_NEWLINE)
      splitted_pango = copy.deepcopy(original_splitted_pango)
      codebox_dict_jolly = copy.deepcopy(codebox_dict)
      partial_pango_vec = []
      while len(splitted_pango) > 1:
         splitted_pango = splitted_pango[:-1]
         partial_pango = cons.CHAR_NEWLINE.join(splitted_pango)
         codebox_dict_jolly['fill_text'] = partial_pango
         codebox_layout = self.get_codebox_layout(context, codebox_dict_jolly)
         codebox_height = self.get_height_from_layout(codebox_layout)
         if codebox_height < self.page_height:
            # this slot is done
            partial_pango_vec.append(partial_pango)
            # let's get ready for the next slot
            splitted_pango = original_splitted_pango[len(splitted_pango):]
            original_splitted_pango = splitted_pango
            partial_pango = cons.CHAR_NEWLINE.join(splitted_pango)
            codebox_dict_jolly['fill_text'] = partial_pango
            codebox_layout = self.get_codebox_layout(context, codebox_dict_jolly)
            codebox_height = self.get_height_from_layout(codebox_layout)
            if codebox_height < self.page_height:
               # this is the last piece
               partial_pango_vec.append(partial_pango)
               break
      for i, element in enumerate(partial_pango_vec):
         if i == 0: codebox_dict['fill_text'] = element
         else:
            index = idx+i
            # add a newline
            print_data.text.insert(index, cons.CHAR_NEWLINE)
            # add a codebox
            new_codebox_dict = copy.deepcopy(codebox_dict)
            new_codebox_dict['fill_text'] = element
            pixbuf_table_codebox_element = ["codebox", [None, new_codebox_dict, None]]
            self.pixbuf_table_codebox_vector.insert(index, pixbuf_table_codebox_element)
